77847013 has 2 divisors, whose sum is σ = 77847014. Its totient is φ = 77847012.

The previous prime is 77846963. The next prime is 77847023. The reversal of 77847013 is 31074877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74338884 + 3508129 = 8622^2 + 1873^2 .

It is an emirp because it is prime and its reverse (31074877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77847013 - 2⁹ = 77846501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77847023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38923506 + 38923507.

It is an arithmetic number, because the mean of its divisors is an integer number (38923507).

Almost surely, 2^77847013 is an apocalyptic number.

It is an amenable number.

77847013 is a deficient number, since it is larger than the sum of its proper divisors (1).

77847013 is an equidigital number, since it uses as much as digits as its factorization.

77847013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 77847013 is about 8823.0954318765. The cubic root of 77847013 is about 426.9863429315.

The spelling of 77847013 in words is "seventy-seven million, eight hundred forty-seven thousand, thirteen".